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Long story short, saw a cheap listing in the local classifieds section for a T90 and a Canon FD 200mm F2.8. I bought it mainly for the glass which turned out to be a turd that needs cleaning, but then I had a look at the T90, put in some batteries and fired it. Seemed to work, but then after a few clicks i got the EEEE error and it would not fire, took out the batteries and put them in again and got it to fire once more before the same EEEE, this process could be repeated predictably. Batteries out and in again, fire, then EEE. Tried googling a bit and found suggestions about bumping it and whatnot, but it didn't seem to do anything so after a while of doing amateurish testing I just put it away in the hoard of other faulty cameras, then fast forward a couple of months and i decided to take a look at it again and whaddaya know.. it now fires every single time and without issue.
So my question, was it perhaps just some capacitor that needed to be recharged?